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<title>Problem 1644. -- [Usaco2007 Oct]Obstacle Course
</title><center><h2>1644: [Usaco2007 Oct]Obstacle Course
</h2><span class=green>Time Limit: </span>5 Sec&nbsp;&nbsp;<span class=green>Memory Limit: </span>64 MB<br><span class=green>Submit: </span>105&nbsp;&nbsp;<span class=green>Solved: </span>61<br>[<a href='submitpage.php?id=1644'>Submit</a>][<a href='problemstatus.php?id=1644'>Status</a>][<a href='bbs.php?id=1644'>Discuss</a>]</center><h2>Description</h2><div class=content>
考虑一个 N x N (1 <= N <= 100)的有1个个方格组成的正方形牧场。有些方格是奶牛们不能踏上的，它们被标记为了'x'。例如下图： 

. . B x .
. x x A .
. . . x .
. x . . .
. . x . .
贝茜发现自己恰好在点A处，她想去B处的盐块舔盐。缓慢而且笨拙的动物，比如奶牛，十分讨厌转弯。尽管如此，当然在必要的时候她们还是会转弯的。对于一个给定的牧场，请你计算从A到B最少的转弯次数。开始的时候，贝茜可以使面对任意一个方向。贝茜知道她一定可以到达。 
</div><h2>Input</h2><div class=content>行 1: 一个整数 N 
行 2..N + 1: 行 i+1 有 N 个字符 ('.', 'x', 'A', 'B')，表示每个点的状态。 
</div><h2>Output</h2><div class=content>行 1: 一个整数，最少的转弯次数。 
</div><h2>Sample Input</h2>
			<div class=content><span class=sampledata>3<br />
.xA<br />
...<br />
Bx.<br />
</span></div><h2>Sample Output</h2>
			<div class=content><span class=sampledata><br />
2<br />
</span></div><h2>HINT</h2>
			<div class=content><p></p></div><h2>Source</h2>
			<div class=content><p><a href='problemset.html?search=Silver'>Silver</a></p></div><center>[<a href='submitpage.php?id=1644'>Submit</a>][<a href='problemstatus.php?id=1644'>Status</a>][<a href='bbs.php?id=1644'>Discuss</a>]</center>﻿<br>

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